Abstract
Direct absorption and melting of 0.2, 0.5 and 1.1 μm polystyrene particles on a Si substrate irradiated by 248 nm excimer laser radiation was found to contribute to their dry laser removal via a “hopping” mechanism at cleaning thresholds of 0.05, 0.1, and 0.16 J/cm2, respectively. Ablation of these particles, which starts near the beginning of substrate deceleration at fluences above 0.4–0.5 J/cm2, suppresses particle removal due to ablative recoil momentum. At fluences above a second cleaning threshold of 0.7 J/cm2 particles are completely evaporated without any visible surface damage of the Si substrate.
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